i know there are a lot of topics in internet about which one is better or in which field which one is better, but i dont know the exact answer. i think these questions are mostly about exprience. and i want to know your exprience.

1) i read an article about valve engineers. it said opengl is faster than directx even on windows. is that true?

2) its said in directx programmer has more controll rather than opengl.

3) which one give better visuals about sahders or technology they use? is it make difference or that is all the same and depend only on programmer that work on them? what about built in effects, particles, lightening,...

4)as I searched in internet, there is no much difference between them, so why Microsoft introduced directx when there was opengl? or why is still developing it? a developer can use opengl for all platforms and forget pain of using a single platform api.

5) I see in engines like unity or unreal that says dx11 version or... it seems using new directx gives more important features. what are those features that can only be used on windows or xbox? are they just for editor or for last output game?

6) what is given in every update of those api,s? for example what is difference of dx10 and dx11? is this about new tools and functions or math or something else? so when in a graphic card is written it supports dx11 what does it mean?

thank you for helping

4)as I searched in internet, there is no much difference between them, so why Microsoft introduced directx when there was opengl? or why is still developing it? a developer can use opengl for all platforms and forget pain of using a single platform api.

I'm not the DX guy any more since changing to OpenGL in the early 2006's but OpenGL was intentially introduced as a graphics state machine a time when Microsoft was on the go for assimilating anything to force people using Windows and only Windows but that is an other story to tell. As far as I have read through the history of GL/DX, it was that GL was not made for high performance realtime graphics rather than be used as replacement for IrisGL from the Silicon Workstations in 1992. Its performance and capabilities were something of crappy and Microsoft decided itself to set a team for developing a counter product called Game SDK and later Direct X includign Direct 3D from version 3.0.

OpenGL itself was less standartised so anyone could develop its own extensions and platform/hardware specific functions for it. This and the lack of support on the early Microsoft Windows systems made developers go for Direct X instead even on the fact that Windows was the onlyx OS on Intel Computers that were much cheaper than Apples Macintosh.

OpenGL 2.0 got the shading model but also has had its fixed function pipeline when its legacy functions got depricated in version 3 and removed from 3.3 GL. When CX rises through its versions 7, 8 and 9 GL was fighting with its standards and extensions. In version 4.0 you have feeled 100 times more dynamic bound functions than core functions to use where DX takes this all for you into a code standard API.

1) i read an article about valve engineers. it said opengl is faster than directx even on windows. is that true?

Have read the same article but that anyways depends on hardware, what programs run in the background and how is the application coded. Using a wrapper library providing an avarage API for both may have one or the other be a bit faster

2) its said in directx programmer has more controll rather than opengl.

From my research this was true. When DX introduced command buffers for rendering OpenGL still seperates some management tasks from the user but Vulkan and DX 12 are now similar in there capabilities

3) which one give better visuals about sahders or technology they use? is it make difference or that is all the same and depend only on programmer that work on them? what about built in effects, particles, lightening

I think because of the history of both, DX hase more tutorials and books when some informations on GL are hard to find but on the other hand GL is a totally open standard when Microsoft dosent need to publish DX informations that go beyond how you use it

6) what is given in every update of those api,s? for example what is difference of dx10 and dx11? is this about new tools and functions or math or something else? so when in a graphic card is written it supports dx11 what does it mean?

Graphics cards are like CPUs, you need to know how to talkt to them on the software level. On newer DX versions may be new capabilities introduced that may for example be the command buffer. DX is like GL mostly a hardware driver talking to the GPU, managing memory and whatever so a graphics card that isnt DX11 ready may not understand and fail up to critically crash when instructions go wrong

Don't let GL's "portability" argument fool you.

I have to respectfully disagree here. Every device with a GPU supports OpenGL. DX is only supported on Windows and XBox. OpenGL wins portability by a country mile. Sure, different platforms and different manufacturers implement OpenGL differently, but I've been able to port my OpenGL engine between Objective-C, C#, Java, and Javascript/HTML5 in about a day per platform.

Otherwise, as you noted, they are the same. For me, it comes down to this : If you are developing only for Windows platforms you should use DX. Otherwise, you pretty much HAVE to use OpenGL.

Every device with a GPU supports OpenGL.

PS4s contain a GPU, but doesn't support OpenGL natively.

PS4s contain a GPU, but doesn't support OpenGL natively.

You got me there.

Every device with a GPU supports OpenGL.

PS4s contain a GPU, but doesn't support OpenGL natively.

its psgl but its said basically its some modification of opengl. portability is most obvois difference of dx and opengl. my question was mostly based on performance, quality and ease of use.